Dropped unneeded file
Added simple issuance/verification test, updated prepare_prover function, cleaned up whitespaces
Merge branch 'master' of github.com:credentials/clib

Conflicts:
	include/credential_crypto.h
	include/credential_terminal.h
	src/credential.c
	src/credential_crypto.c
	src/credential_terminal.c
Make some builds optional
Corrected some remaining build issues